/*
 * MIT License
 *
 * Copyright (c) 2020 Yuriy Kulikov
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.better.alarm.stores

import io.reactivex.Observable
import io.reactivex.subjects.BehaviorSubject

class InMemoryRxDataStoreFactory : PrimitiveDataStoreFactory {
    companion object {
        @JvmStatic
        fun create(): PrimitiveDataStoreFactory = InMemoryRxDataStoreFactory()

        fun <T : Any> inMemoryRxDataStore(defaultValue: T): RxDataStore<T> {
            return object : RxDataStore<T> {
                private val subject: BehaviorSubject<T> = BehaviorSubject.createDefault(defaultValue)
                override var value: T
                    get() = requireNotNull(subject.value)
                    set(value) = subject.onNext(value)

                override fun observe(): Observable<T> = subject.hide()
            }
        }
    }

    private val booleans = mutableMapOf<String, RxDataStore<Boolean>>()
    private val strings = mutableMapOf<String, RxDataStore<String>>()
    private val ints = mutableMapOf<String, RxDataStore<Int>>()

    override fun booleanDataStore(key: String, defaultValue: Boolean): RxDataStore<Boolean> {
        return booleans.getOrPut(key) {
            inMemoryRxDataStore(defaultValue)
        }
    }

    override fun stringDataStore(key: String, defaultValue: String): RxDataStore<String> {
        return strings.getOrPut(key) {
            inMemoryRxDataStore(defaultValue)
        }
    }

    override fun intDataStore(key: String, defaultValue: Int): RxDataStore<Int> {
        return ints.getOrPut(key) {
            inMemoryRxDataStore(defaultValue)
        }
    }
}
